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Goodwill and Other Intangible Assets Goodwill by Segment (Details) - USD ($) $ in Millions | 1 Months Ended | 5 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | May 31, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |  |  |  |
Goodwill Beginning Balance |  | $ 10,179 | $ 10,193 |  |
Currency Translation Adjustment |  | 70 | (28) |  |
Other goodwill adjustments and acquisitions |  |  | 14 |  |
Segment realignment |  |  | 0 |  |
Goodwill Ending Balance |  | 10,249 |  |  |
Agriculture [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill Beginning Balance |  | 0 | 10,193 | [1] |
Currency Translation Adjustment |  | 0 | (28) |  |
Other goodwill adjustments and acquisitions | [2] |  | 14 |  |
Segment realignment |  |  | (10,179) |  |
Goodwill Ending Balance |  | 0 |  |  |
Goodwill, Impaired, Accumulated Impairment Loss |  |  |  |  | $ 4,503
Crop Protection [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill Beginning Balance |  | 4,726 | 0 |  |
Currency Translation Adjustment |  | 33 | 0 |  |
Other goodwill adjustments and acquisitions |  |  | 0 |  |
Segment realignment |  |  | 4,726 |  |
Goodwill Ending Balance |  | 4,759 |  |  |
Seed [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill Beginning Balance |  | 5,453 | 0 |  |
Currency Translation Adjustment |  | 37 | 0 |  |
Other goodwill adjustments and acquisitions |  |  | 0 |  |
Segment realignment |  |  | $ 5,453 |  |
Goodwill Ending Balance |  | $ 5,490 |  |  |
[1] | Net of accumulated impairment losses of $4,503 million.
[2] | Primarily consists of the acquisition of a distributor in Greece.

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